package top.aiprogram.common.filter;

import top.aiprogram.login.Teacher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "SessionTimeOutFilter")
public class SessionTimeOutFilter implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)resp;

        if(request.getRequestURI().contains("login")){
            chain.doFilter(req, resp);
        }else {
            Teacher teacher =  (Teacher) request.getSession().getAttribute("userinfo");
            if(teacher==null){
                request.getRequestDispatcher("login.jsp").forward(request,response);
            }
        }

    }

    public void init(FilterConfig config) throws ServletException {

    }

}
